Peter Nyborg is based on Nordic expressionism, but his works have a greater degree of abstraction and apparent coincidence, like American action-painting. The earliest works were black-and-white and were motivated by the Cobra artists, in particular Carl-Henning Pedersen, but replaced by images whose colors are driven up into the highest register or down into the deepest. The works may be made up of strong blue, smoldering reds, intensely yellow or light, spring-green colors, but also of black, white and brown shades. The paint layer can be quite thin or cream cheese with dashed lines. Some paintings express visions of the tranquility and beauty of the universe, but may nevertheless be characterized by a ferocity in the struggle of the forms against each other that may make them appear as representations of pagan rituals.